The latest hermetically sealed solid-state relay (SSR) from Teledyne Relays – model LD00KM – incorporates silicon carbide (SiC) power MOSFETs. It is able to operate with loads up to 270 V d.c., 10 A and will not heat up as much as traditional silicon MOSFETs; especially when driven near full load. This is the product of a low on-resistance of just 0,042 at ambient temperatures, resulting in smaller heatsinking and reduced cooling requirements.
This relay also boasts optical isolation between control and load circuits to ensure that the high-voltage load does not interfere with the low-voltage control system, and vice versa. It also features fully floating power FET technology meaning that the load can be connected to either of the output terminals. Other characteristics of SiC SSRs are their reduced noise characteristics compared to traditional silicon MOSFETs, and lower gate voltage swing and gate charge than comparable silicon equivalents.
This SSR is ideal for primary and secondary power systems in commercial, civil or military aircraft, shipboard power systems, high-voltage DC-DC converters, pulsed power applications and high-inductance loads. Teledyne also aims to create a higher current handling version of this relay – the LD00KQ – which will boast load handling characteristics at 270 V d.c. @ 20 A.
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